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CVE-2026-68555— coturn: Chained mobility resumes allow authenticated remote memory exhaustion

Quick assessment

Affected
coturn coturn
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Coturn是Coturn组织开源的一款实现TURN协议的服务器软件。 Coturn 4.15.0至4.16.0之前版本存在资源管理错误漏洞，该漏洞源于移动性会话恢复处理不当，导致会话分配超时被解除和链接覆盖，且配额检查失败被忽略，可能导致经过身份验证的攻击者保留无限制的服务器端会话并耗尽进程内存。

CVSS 6.5 · Medium EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
coturn coturn >= 4.15.0, < 4.16.0 affected
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I. Basic Information for CVE-2026-68555

Vulnerability Information
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Vulnerability Title
coturn: Chained mobility resumes allow authenticated remote memory exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
Coturn is a free open source implementation of TURN and STUN Server. In 4.15.0, an authenticated TURN user can repeatedly resume one allocation from fresh UDP 5-tuples without completing a handoff when the server enables --mobility. mobile_begin_transition() in src/server/ns_turn_server.c disarms each new session's allocation timeout and overwrites the allocation's single mobile_pending_resume link, leaving earlier pending sessions unreachable by the cleanup path, while copy_auth_parameters() ignores inc_quota() failure. The attacker can therefore retain unbounded server-side sessions and exhaust process memory even when --user-quota=1 is configured. This issue is fixed in version 4.16.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Coturn 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Coturn是Coturn组织开源的一款实现TURN协议的服务器软件。 Coturn 4.15.0至4.16.0之前版本存在资源管理错误漏洞，该漏洞源于移动性会话恢复处理不当，导致会话分配超时被解除和链接覆盖，且配额检查失败被忽略，可能导致经过身份验证的攻击者保留无限制的服务器端会话并耗尽进程内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coturn coturn >= 4.15.0, < 4.16.0 -

II. Public POCs for CVE-2026-68555

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III. Intelligence Information for CVE-2026-68555

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Patches & Fixes for CVE-2026-68555 (1)

Vendor Advisories for CVE-2026-68555 (1)

Vendor Pages for CVE-2026-68555 (1)

Same Patch Batch · coturn · 2026-08-19 · 4 CVEs total

CVE-2026-68553 7.1 HIGH Coturn: Format String Injection via TURN USERNAME/REALM into hiredis Redis Command
CVE-2026-68552 5.3 MEDIUM Coturn: uint16_t truncation overflow in STUN message length causes TCP stream framing bypa
CVE-2026-68554 2.3 LOW Coturn: STUN attributes after MESSAGE-INTEGRITY are processed, letting on-path attackers m

IV. Related Vulnerabilities

Same product: coturn
Same vendor: coturn
Same weakness: CWE-400

V. Comments for CVE-2026-68555

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